Given below are two statements: 
Assertion (A): If there is no external torque on a body about its centre of mass, then the velocity of the centre of mass remains constant.
Reason (R): The linear momentum of an isolated system remains constant.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.
 

Subtopic:  Torque |
From NCERT
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Given below are two statements: 
Assertion (A): The speed of a whirlwind in a tornado is alarmingly high.
Reason (R): If no external torque acts on a body, its angular velocity remains conserved.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Torque |
From NCERT
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Given below are two statements: 
Assertion (A): If polar ice melts, days will be longer.
Reason (R): Moment of inertia increases and thus angular velocity decreases.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Angular Momentum |
 78%
From NCERT
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Given below are two statements: 
Assertion (A): The centre of mass of an electron and proton when released moves faster towards the proton.
Reason (R): This is because the proton is heavier.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Center of Mass |
From NCERT
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Given below are two statements: 
Assertion (A): For a system of particles under a central force field, the total angular momentum is conserved.
Reason (R): The torque acting on such a system is zero.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Angular Momentum |
 84%
From NCERT
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Given below are two statements: 
Assertion (A): If the ice cap of the pole melts, the day length will shorten.
Reason (R): Ice flows towards the equator and decreases the moment of inertia of the earth. This increases the frequency of rotation of the earth.
  
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Angular Momentum |
 72%
From NCERT
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Given below are two statements: 
Assertion (A): The centre of mass of a two-particle system lies on the line joining the two particles, being closer to the heavier particle.
Reason (R): The product of the mass of one particle and its distance from the centre of mass is numerically equal to the product of the mass of another particle and its distance from the centre of mass.
 
  
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Center of Mass |
 68%
From NCERT
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Given below are two statements: 
Assertion (A): A person standing on a rotating platform suddenly stretched his arms. The platform slows down.
Reason (R): This happens as angular momentum is conserved.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Angular Momentum |
 83%
From NCERT
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Given below are two statements: 
Assertion (A): There are very small sporadic changes in the period of rotation of the earth.
Reason (R): The shifting of large air masses in the earth's atmosphere produces a change in the moment of inertia of the earth causing its period of rotation to change.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Angular Momentum |
 84%
From NCERT
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Given below are two statements: 
Assertion (A): A judo fighter in order to throw his opponent onto the mat tries to initially bend his opponent and then rotate him around his hip.
Reason (R): As the mass of the opponent is brought closer to the fighter's hip, the force required to throw the opponent is reduced.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Torque |
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh